Magnesium stearate is a fine white powder made from magnesium and stearic acid (a fatty acid). In skincare products, it's used as a glidant and anti-caking agent to improve texture and prevent clumping in powders and tablets.
Benefits
Improves product texture and spreadability
Prevents caking in powder formulations
Helps with product stability during manufacturing
Potential concerns
May cause mild irritation or allergic reactions in sensitive individuals
Can create a slight film on skin if used in high concentrations
Rare potential for clogged pores in acne-prone skin at high levels
Science: Magnesium stearate is widely used in pharmaceutical tablets and cosmetic powders as a processing aid. The provided research confirms its use in tablet formulation at optimal concentrations without safety concerns in that context. Limited peer-reviewed dermatological data exists for topical skincare applications, but it is generally recognized as safe by cosmetic regulatory bodies at typical use levels.
Microcrystalline cellulose is a natural, plant-derived powder made from purified cellulose fibers. In skincare, it's used as a texturizer and absorbent to create a smooth feel, improve product consistency, or help mattify skin by absorbing excess oil.
Benefits
Absorbs excess oil and moisture for a matte finish
Improves product texture and spreadability
Derived from renewable plant sources rather than synthetic materials
Science: Scientific literature confirms microcrystalline cellulose is non-toxic, biocompatible, and biodegradable with a strong safety profile across cosmetic, pharmaceutical, and food applications. No notable sensitization or irritation concerns are documented for topical use.
